Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab16cce0ad14f8a3…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 16:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8b5196cf9365355233969c4077ecab8 SHA-1: a3f1ba78317a7554debff101e1a63e28e1d29b68 SHA-256: ab16cce0ad14f8a3f9da648d600bdf93bc284a95c415d65c3232e9ff5cf68ca1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hublihorse.com/uploads/userfiles/files/61537808436.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55093268273.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wawujesonefi.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/kitowasiv.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/50104816531.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/xudejikejowalobo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c736aab933---nipaxaxenukozaxakujas.pdfIn PDF document text
    • https://foulardfotografando.it/file/94165642400.pdfIn PDF document text
    • https://baongochoa.com/upload/file/557555482.pdfIn PDF document text
    • http://hengtongblower.com/d/files/4686153631.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/11496644358.pdfIn PDF document text
    • http://surestegc.org/documentos/file/65106119262.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/kujamavafamo.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/55995113405.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/23959965675.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/40486172131.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/56392642778.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/mufelivezite.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2k4ev04o9emqbp2gqhstkmugaa/3232498774.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/wabej.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/99143484968.pdfIn PDF document text
    • http://chenruichem.com/upload/files/zidekejenowiwoxaweju.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/kigeferuludukag.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/37898523439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=asphalt+2+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 10564 bytes
SHA-256: 07f65094dba7885acb7e4aea749996e7c420184f63e6ba31c5943a614b454995
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 15352 bytes
SHA-256: b9c4b7dfa118dbec5d864f436dcab1c4ca418e4a3da8db8d52b8a67bf49a2d7b